Here are a few numbers which can act as limitations for programming,

1. Page Load time / Startup Time

less than ~ 600ms

2. Memory Consumption

If a page consumes 1MB and the RAM of the machine is 1000MB then, that means the site can have a maximum of 1000 views per second.

3. Processing speed

It has to be fast

4. Learning time

Time to get the first productive output from the software.

5. Memory speeds

Register – x
Cache – 10x
Memory – 100x
Disk – 1000x
Network – 10000x

6. Language speeds

Asm – x
C – 2x
C++ – 3-4x
Objective – 3-5x
Rust/Julia – 5x
Elm/Go/Java/Crystal – 10x
Javascript – 20x
Python/ruby/perl – 100x
Shell – 500x